Gif exports different than file- plz help!!

Hi all,

I have an issue with my gif exports. I have been creating them for a long time- always fine. Now since a month or so the exported/saved as gif version do not look like the original file.

I have tried all the settings (or i think i have;)

It's when the background is transparent- the lines of the gif come out very thick and also with grainy edges. I used to either use 'save for web' or just 'save a copy' and choose the gif extansion- but both now give me the issue.

attached are two screenshots of the difference in look, the first one the original file in ps the second the saved gif.  I would so appreciate any help!!! have tried all i know and searched far and wide. thank you