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~~pulse dissaper in digital scope just by looking at different signal in other channel.~~

Pulse disappear in digital scope just by looking at different signal in other channel.

~~I have HANTEK 6022BE, and I'm monitoring tree signal using it,~~
~~1. FS (Frame sync clock)~~
~~2. Pulse~~
~~3. Transfer complete~~
~~I'm using two channel of scope to monitor pair of these.~~
~~The problem is when I'm looking at signal 1 and 2 I can see here: (The yellow is 2 and blue is 1.)~~
![1_2](https://electrical.codidact.com/uploads/it4acu7xt1k87bn5345anpytltkp)
~~In looking at 2 and 3 (yello is pulse and blue is TC):~~
![2_3](https://electrical.codidact.com/uploads/obrknbnu7nz7kj7ar23ttymr458q)
~~Magically one pulse of signal 2 (pulse) has been vanished! But why?~~
Generally looking at pulse alonely will causes neglecting one pulse. But only by signal FS all 6 pulse will be visible. How this can be!!

I have a HANTEK 6022BE oscilloscope and I'm monitoring three signals with it:
1. FS (Frame sync clock).
2. Pulse.
3. Transfer complete.
I'm using two channels of the scope to monitor a pair of these.
The problem is when I'm looking at signal 1 (in blue) and 2 (in yellow) I see this:
![1_2](https://electrical.codidact.com/uploads/it4acu7xt1k87bn5345anpytltkp)
When looking at 2 (pulse, in yellow) and 3 (TC, in blue) I get this:
![2_3](https://electrical.codidact.com/uploads/obrknbnu7nz7kj7ar23ttymr458q)
Magically one pulse of signal 2 (pulse) has vanished! But why?
Generally looking at pulse alone will cause neglecting one pulse. But only by signal FS all 6 pulses will be visible. How can this happen?!?

oscilloscope