This may help because I ran into the same situation with a client. The client, a minister, received a small amount of schedule C income from weddings, funerals, etc. The negative number on Form 8895 came from totaling the following figures (using round numbers for the example):
Net Schedule C Income: $600
(less deduction for 1/2 of SE Tax on Schedule 1, Line 14): ($6500)*
QBI Loss on Line 1, column C of form 8995: ($5,900)
*Self employment tax was $13k because of wages and housing allowance
So, this at least explains where the negative number comes from. Hope this helps.
