There seems to be a weird behaviour when it comes dynamics and suffixes.
Dorico correctly inserts a space after p dynamics but doesn’t do so for forte dynamics. I always have to go to the panel and insert the space manually after forte.
For comparison :
I don’t see the same appearance as you describe when using Minion Italic (which if my eyes don’t deceive me is the font you’re using here):
Perhaps you could attach a minimal project that exhibits the problem?
Thank you Daniel for your quick response ! It seems that the problem was from the music font !
Thanks once again
The negative right side-bearing of f used in your music font is maybe for having the next f, z to set as close as possible to the initial f
You might need to set the righ side-bearing to 0 then set the left side-bearing of f and z to some negative value.