Today I used Heidi for the first time (together with SQl server 2016).
I have a table with 3 columns Col1 (boolean) Col2 (NVarChar) Col3 (boolean)
Col 1 = 1 Col 2 = Jim Col 3 = 0
When I change Col 2 to Jimmy than Col 1 turns into T,rue and Col 3 Turns into Fa,lse
Checking with SSMS I noticed that in fact only Col 2 changed to Jimmy and there were no errors.
Refreshing the table again showed 1 and 0 for columns 1 and 3.
So it is not a big problem, but it is rather strange.