I am so glad I searched this! I have been taking lessons, doing the puzzles, playing toms of games, reading books, and Martin beat me handedly the past three times we played. I'm talking barely taking a piece lol.
Bots on mobile app

Hey let's play a chess game before going to sleep. Haaa, let's try a 850 elo bot to relax ... 2 hours later ... "WTF I'm doing, how can a lose every time, this spanish opening is useless, ..."
Welcome to my night ! XD
I only play the mobile bots and they're destroying a nube like me. Also I've suddenly got a record of beating a few of every level including grand masters!

Wow I'm glad I found this thread. For 2 days where I was only able to play on my phone this bug was making me think that not only was I not progressing but also getting way worse since I've been beating the 1000 rank bot on PC but couldn't even beat the 250 bot on my phone. I confirmed I have v4.2.6-googleplay but I couldn't find any updates in the play store...

I was getting so frustrated by Martin!! I've played the lower rated bots before and couldn't believe I was getting so thrashed. I realised there must be a bug because they weren't playing any 'stupid' moves on their first turns, but (as far as I can tell) standard opening moves. I ended up beating Martin once after super slowing down and going into the analysis board to look at how moves might work (no computer analysis) and I felt so good - but really, it was an amazingly tough struggle. Please fix this! Every now and again I need to be able to play for a nice certain win

The new update definitely made it better but I've done testing today and still find a mismatch on the browser bots vs android bot. 1500 android bot is playing at about 1700+ compared to the browser bot. It is not a massive difference but enough to win 80% of the time vs 1400-1500 on browser but win less than 20-30% at the same range on android.

I also noticed on android the bots (no matter what level) will suddenly pull off GM level plays for a 5-6 move checkmate or a complete destruction of your position (even Martin at 250 will do it rarely). On browser this doesn't happen almost at all. Weird?!

Had similar feeling some time ago (but here, not some mobile app) that Jimmy(600) is "too adaptive" - played like around 1800-2000 - could beat him, but when I was temporary losing concentration miracles happened and often he suddenly start gaining advantage. But that was a while ago, now it's back to old good 600
(altough probably still adaptive) and easy win.
Fixed on version v4.2.7-googleplay-210478
Great!