I see $1 charged for transaction

I was having $100.05 in my account today.

I bought 6 shares of SSBI for $92.34 today 2 minutes before market closing.

The market value at closing was $92.16

Having made 0.2% loss on this transaction my total Equity should have been $99.87 but it was $98.85 at the end of the day. Please explain the $1 difference.