[S] Uknown cable tv show 2017?

Was it "The Problem Solverz"? The first season was on Cartoon Network but season 2 was on Netflix.

I looked up the movie on the CN Schedule Archives wiki, and there were 6 airings of it in 2017, all in April (lining up with the timeframe). Since I'm not sure what time you saw it, I'm just gonna post the first show that came after each airing.
April 2: The Brak Show
April 3: Cloudy With a Chance of Meatballs: The Show
April 9: How to Train Your Dragon (disqualified since it's CGI)
April 10: Teen Titans GO!
April 29: Dragon Ball Super (disqualified since it's an anime)
April 30: The Powerpuff Girls 2016
Was it any of these?

Was it Mighty Magiswords? There’s monsters in that show. Another suggestion is Clarence, which fits more with your description of looking like a child’s drawing. Both these shows would’ve been airing at that time.

Secret Mountain Fort Awesome?

Here's more information.
It looked like the master was on tape, the way of watching it was not on tape. The aspect ratio looked like it was stretched. What it looked like was a crayon drawing in a room with poorly drawn monsters. It does not have to be on Cartoon Network since the sky was kind of dark, so the channel could have been switched.
My only theory is that it could have been the Rugrats episode Home Movies since I know that some episodes of that show would air late at night.  

drawing of what I remember it looking like:

yeah image doesn't load and is dead

EDIT: Suggestion to download the image and the reupload to an image hosting site and post the actual .jpg file link with a post to the .jpg link/file or embed the proper .jpg link. Google direct linking almost always breaks.

Yep.