AC and spell save DC bugs in combat

I am playing a Paladin with base AC 16 and adjusted AC 19.

When I’m in combat, the game ignores my adjusted AC and shows my base AC of 16 in the encounter character sheet. When I then “fix” my AC in the combat encounter sheet to be my adjusted AC, the game then change my base AC to 19 as well in my main character sheet. This is a bug. The combat charater sheet should show base and adjusted AC and then use the adjusted AC for vs attack rolls.

Also the game is calculating Spell save DC wrong when in combat. And there is no way for one to fix that except prompt the LM to redo that round.

i.e. Spell save DC = 8 + your proficiency bonus [+4] + your Charisma modifier [+5]: Spell save DC = 17.