Homematic: HMIP-SWO-PL rain counter shows wrong value

Add-ons Bindings
1

I am on openhHAB 3.4.2 and have connected my homematic devices via homematic binding.
In the homematic webUI the rain counter shows
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The thing channel in openHAB shows

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I would expect both values to be the same.

2

This is the same for me:
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In openhab it got reset one week ago and I have no idea why:
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I mean, I can live with that, but it would be nice to understand.