Something strange happened yesterday with my character mana

My caracter is a thief (level 60). Since yesterday, something strange has happened. My character was working very well, but now I hardly shoot a bow anymore. I haven’t change anything !?! I’ve done some research on the internet, and as far as I can see, the problem comes from basic skills.

Since yesterday, my basic skills cost 25 of mana each. So I shoot 5 arrows with my basic skill and then I am out of energy (my mana level shows 125) and I can’t shoot anymore until the mana comes back up. Tutorials on the internet show that basic skills generate mana or at least do not spend any. I have no idea what’s going on.

Thief?
Are you playing D4 or Skyrim?

Probably they started already pre patching for S8???

It is « voleur » in french so I just translated in English. I have never played Skyrim Lol. I guess it is the Rogue Caracter. I use the basic skill: Forceful Arrow. I updated it to rank 11/5 and I don’t see why there is a cost of 25 of mana each arrow shoots from a bow.