@rafal i have similar issue but it might be related to different root cause:
got feeling this is caused by IBKR transfer out and in operation when migration happened
got this issue for most stocks in IBKR, like I have 22 500 % rate of return… which is not possible 
Try deleting all transfer transactions on IBKR that relate to HU - IE transfer. Take care not to delete regular cash transfers.
Just navigate to IBKR and on the transactions tab you can filter by transaction type in the search box above the table, plus sort the list by first column to have them sorted by date. From there you can select the whole month and delete all of them in one go.
