I have come across a strange circumstance with the numbers column. When I enter a number that ends in a zero (e.g. £75000) it appears in the number column as £74,999.
Has this problem been detected before?
I have not seen that. Which product (CRM/Work Management, etc) and level (Pro/Enterprise) do you have?
Desiree - www.thecleverclovers.com
Monday Work Management - Enterprise
Hi Ian! 
Shannon here with the monday team. This sounds like atypical behavior to me! I cannot replicate the same behavior when I test in my demo account:
Further, there are no specific settings or filters that would influence this. I’d try recreating your Numbers Column to confirm whether the behavior persists in the new one. Additionally, if you open your board on a private/incognito web browser window, does the issue still occur there? Testing in a private/incognito web browser helps to determine whether the behavior is a potential bug or tied to the local data in your original window. Local data can often impact platform performance.
If you are still running into the issue following these two tests, please email support@monday.com and outline the troubleshooting steps you’ve already attempted, so your case can be escalated for further investigation with our Technical team.