When crafting items by pressing the DROP key, the statistics will only show you having crafted 1 of the item instead of, say, 9 redstone dust from redstone block->dust.
Interestingly, it seems like it does correctly account for stack size when also holding down CTRL at the same time.
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Thank you for your report!
We're actually already tracking this issue in MC-116618, so I resolved and linked this ticket as a duplicate.
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This is a separate issue that has nothing to do with creative mode or deleting items. This bug happens in survival mode as well and only affects statistics.

This is a duplicate ofย MC-65198
This only happens in Create mode.
Edit: Weird, now I can't reproduce it adding 9 at a time anymore. Maybe something else affects it. It's also a bit annoying to test, because statistics update so slowly.