Some spell save DCs on spells are bugged

Even with the spell save mod being for example DC17 sometimes it's not the same number on the spell even when edited.

Can you give a specific example, with reproduction steps and the name of the sheet you are using?

I'm assuming that you are using the 5e OGL character sheet. If so, I would check that the spellcasting ability for the specific spells (must first open the spell's options by clicking the cog wheel for the spell) are set to SPELL rather than something else. This feature was recently added (I think in version 2.2 of the character sheet) and spell by default were set to NONE rather than SPELL.

Alright that helps thanks. It must of been just the update that reset those.