Alesis Sample Pad Pro - SD card not being read unless manually pushed in

I have loaded samples onto my SD card and have put it in the SD card slot of the Alesis Sample Pad Pro. The card clicks into place.

However the Pro says "No SD Card". When I manually push and hold the SD card a little further in as if to release it, it then recognises the SD Card. If I let go it says "No SD Card" again.

Is the SD Card slot faulty? Is my SD card the wrong type (it's a SD card convertor for Micro SD so wonder it is slightly the wrong shape?)

Any help much appreciated!
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