Looking at your holding of #127 it would appear to be zero - perhaps a rounding error in your summing up of the loan holdings, or a carry over from when sales used to go to the cash account when set to withdraw?
Could you double check and if there's an issue let me know and I'll investigate more forensically at this end.
The relevant statement entries:
1903371 2014-11-17 17:28:01.531904+00 Purchase loan part 1800829 (old id 1800381) for 1.28 GBP - principal 1.28, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -1.28
1903392 2014-11-17 17:29:15.838309+00 Purchase loan part 1801181 (old id 1800830) for 0.42 GBP - principal 0.42, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -0.42
1911125 2014-11-18 11:13:51.628488+00 Purchase loan part 1884762 (old id 1876969) for 3.92 GBP - principal 3.92, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -3.92
1911143 2014-11-18 11:15:19.633206+00 Purchase loan part 1885200 (old id 1884763) for 1.40 GBP - principal 1.40, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -1.4
1912396 2014-11-18 15:28:15.461747+00 Purchase loan part 1892083 (old id 1891844) for 0.48 GBP - principal 0.48, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -0.48
1912457 2014-11-18 16:15:16.983631+00 Purchase loan part 1892604 (old id 1892084) for 7.76 GBP - principal 7.76, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -7.76
1912469 2014-11-18 16:15:51.104799+00 Purchase loan part 1892896 (old id 1891508) for 0.65 GBP - principal 0.65, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -0.65
2027713 2014-11-27 15:08:37.896852+00 Principal repayment for loan Fa****** Wind Turbine Loan (127) 1.340901765
2071005 2014-12-03 16:16:02.833699+00 Interest payment for loan Fa****** Wind Turbine Loan (127) 0.088463289
2071899 2014-12-03 16:16:04.512272+00 Interest payment for loan Fa****** Wind Turbine Loan (127) 0.002794059
2080614 2014-12-03 18:14:21.236031+00 Interest payment for loan Fa****** Wind Turbine Loan (127) 0.002794059
2300016 2014-12-31 08:37:29.21711+00 Interest payment for loan Fa****** Wind Turbine Loan (127) 0.08498636
2424323 2015-01-14 18:18:51.624435+00 Purchase loan part 4551345 (old id 4551181) for 0.13 GBP - principal 0.13, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) -0.13
2938816 2015-01-30 09:56:58.275123+00 Interest payment for loan Fa****** Wind Turbine Loan (127) 0.085390804
3006272 2015-02-03 10:42:02.913168+00 Sale of loan part 6909513 (new id 6930496) for 9.88 GBP with a fee of 0 GBP - principal 9.88, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) 9.88
3006277 2015-02-03 10:42:02.913168+00 Sale of loan part 6909513 (new id 6930497) for 3.52 GBP with a fee of 0 GBP - principal 3.52, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) 3.52
3006282 2015-02-03 10:42:02.913168+00 Sale of loan part 6909513 (new id 6930498) for 1.10 GBP with a fee of 0 GBP - principal 1.10, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) 1.1
3006287 2015-02-03 10:42:02.913168+00 Sale of loan part 6909513 (new id 6930499) for 0.20 GBP with a fee of 0 GBP - principal 0.20, annualised rate 9.750, loan: Fa****** Wind Turbine Loan (127) 0.2
Note that the line
2027713 2014-11-27 15:08:37.896852+00 Principal repayment for loan Fa****** Wind Turbine Loan (127) 1.340901765
is the only non-interest line for anything other than an exact round number of pence.
To balance things, it "should" have been balanced by a sale of a non-round number of pence - e.g. the final sale as 0.199098235 rather than 0.2.
Although I've not done an exhaustive search, I've never seen a sale or purchase transaction for anything other than a round number of pence. Intuitively, I would expect them to be common - e.g. after a capital repayment, a non-round purchase would usually be required to restore the target. Either the non-round sales and purchases are really happening "behind the scenes", but there's a display issue causing them to appear rounded to us, or there's an account balancing issue causing the odd fractions to "disappear" and/or get created out of thin air somehow.