Block Rocker IPA76C FM tuner is skipping every even digit

on my Block Rocker the FM-tuner is working not in a correct way.
When I press the buttons to search for the right channel, then every even digit will be skipped. Only the uneven digits will be found.
In my case I need 88.8, but the tuner is working only with 88.7 or 88.9. There is no way to reach the 88.8.
I tried already to search the whole range of the FM-tuner that maybe it will start afterwards with the even digits, but I was not lucky
How is this possible?
Could you help?
Many thanks
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