Sketchup is acting up

Suddenly Sketchup is acting up. I opened Sketchup as always drew a line typed in 28.5 in. and the line didn’t change to 28.5 in rather when I move my curser to draw my next line the line goes in an opposite direction of where I move my curser to. I can no longer just draw lines to the length I want to and go to my next line. is this a setting issue? I tried a repair didn’t help

clicked return after input?