Copy paste gives wrong cell

Hi
I'm working on a large spreadsheet and trying to update the information by copying from another spreadsheet some numbers and names.
Something weird happens, I copy a column of numbers and when pasting it, the first one is skipped.
So if I have A1-5 A2-10 A3-15 when i copy to the new sheet I'm trying to update I get A1-10 A2-15 A3-0.
There are no hidden cells, nothing collapsed, and the cells are the same. I don't see any visible reason why it happens. The formatting shows regular numbers.
If I type the number then it works (but I have 15,000 of them) but if I copy paste it skipps.

Anyone knows how to fix it?

Thanks!

Unfortunately, I can't add the file as it's confidential information, and it's that specific file that gives me hard time.
I'm not pasting formulas, just the values. But I feel like it's been formatted in a way that changes it.
The formulas that already built into the model looks like =[@[Short Name]] and when I tried manually entering information the formula showed me 0.
I'm really confused by it
Does it make sense?

Error found
There was a problem with the filtering causing all the pasted values to shift by one.

Thank you!