Massive Photoshop 2018 problems.

I don't know what adobe did but the kerning is now not working. when you place in a value it jumps numbers all over the place and wont take the number you put in. And most of all I use to save  8 1/2 x 11 pages as jpegs at 96 DPI and 1200 DPI and it always saved them under 1 meg and now its saving them as almost 9 meg files. I'm doing nothing different at all but the way its saving is unacceptable. Really not liking the new update but can't even use the 2017 version because when I did the cloud update it got rid of the 2017 version. Does anyone know why the saving a jpeg is no saving the files this large?