hi,
for the first issue that you are facing:
it is because you have not saved that particular element you have saved the pdf certificate hence the changes for that element will be lost and saved with the previous changes.
if you are making changes on an element then you have to save that particular element.
there is option "save element" you have to click that.
i have made changes on your setup refer:
https://prnt.sc/s0yxzt
and for the pdf certificate please try to deactivate third party plugins. i have noticed that you have more than 70+ plugins on your site there is chance of conflict the third party plugins. so please try to deactivate them.