Client window automatically switches sizes

Just today my client started automatically switching from the regular 1280 x 720 size to the smaller 1024 x 576 and I don't know why. It happens after every game. Also when I switch back to 1280 x 720 I have to go back and forth from 1024 x 576 twice or it will stay as a 1024 x 576 size window but the text and images will be as if it were the 1280 x 720 size which makes the settings inaccessible and I have to restart the client.
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