Why was computer 'downgraded'?

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lnfrnc

The Chess.com app for android was upgraded about a week or two ago and before that I used to lose against the computer very badly on level 4 (1000 rating). After the update, I noticed I can easily beat the computer on level 4 and level 5 (1200 rating). It gets hard again on level 6 (1400 rating).

 

I have been playing more often and I'm sure I am getting better little by little, but I know the computer had to have been downgraded.

 

Is there any reason for this?