How are you fitting them on?
I guess you jack the engine up and bolt the bracket on to the block then lower it to the mount?
The only thing I could think of is that if you didn't disconnect the bracket from the mount then it may interfer with it tightening nicely against the block.
I suspect you aint doing that as it would be harder than doing it disconnected from the mount.
Maybe the bolts are simply gay?
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