Problem using external monitor via HDMI

Hi.

Using keynote (sequoia 15.1 on macbook pro m1 and keynote 14.2) to show presentation on external monitor via HDMI-HDMI cable, I get the following problem.

When a switch from a slide (1 ) to the next (2), it happens that on the mac monitor the next slide (2) is shown, but on the external monitor not (slide 1 remains on the screen). Then if a switch to the next one (slide (3) I get slide 3 on both mac and external monitor. Then I go back and I get slide 2 on both.

After then if a click for next slide I get slide (3) and many and slide2 is still on the external monitor, and so on...

Does anybody get the same problem?

I got same problem with other HDMI-HDMI cable as like as with USBC-HDMI

BR

Roberto