ENBT integer shows different number in overlay than in chat!

I set up a scoreboard with a number, which gets influenced by player death...

Then i set up a procedure which sets an NBT tag to the scoreboard, and displays it in chat:

(picture): https://ibb.co/hMXSLk5

Then i set up an overlay which displays the "ENBT:integer:taglives" tag.

When I go in-game the tag displays a different number in chat than in overlay:

(picture): https://ibb.co/1LpBXp4

I set an item that increases the scoreboard number on right click, and it actually increases the tag in the overlay as well!?

(There is no nbt tag in the right click procedure).

I've also tried using a global_session variable,

this actually displays the right number but a different problem occurs:

the number flickers in the overlay between all the players scoreboards scores that have been on the world.