Strange Tempo change issue here

[mnstudio]

Something strange is happening here: if use the mouse to write a tempo change of about 1 bpm point less, PT slows the tempo much much more than it should. Viceversa, if I put the tempo change using the little cross at the left of the tempo area, all is fine. Any other is encountering this issue?
Watch it

https://www.dropbox.com/s/lns0rnen9h...%20PT.mp4?dl=0

[_JJ_]

I never knew how to do that using the mouse ... but I'll mention that in your video the tempo change done that way shows 1/8th note = 84 as opposed to the 1/4 note = 80 using the other method. So it's the "resolution" of the shortcut - likely a preference somewhere...

[mnstudio]

You are right. It's the tempo change resolution. It must be set in the icon to the left
I didn't notice it. Thank you