UDF seem to be calculating when non dependant cells are edited

I am new to VBA so I do not know fully how Excel handles UDF

I have about 33 UDFs that are used for analysing waves, non of them are volatile. I have calculations across 10 worksheets on one workbook with a few thousand cells being used in each worksheet

My issue is that I can type in any cell that is empty with no cells referencing it and when I enter the data in the cell, excel seems to be calculating stuff and this can slow down the use of the worksheet by a few seconds after typing in any cell.

I have tried using the watch window and I can see that all my UDFs seem to do something even though I am typing in non dependant cells

I was hoping someone could help explain why UDFs would seem to calculate when typing in any cell and how to stop it. I want it to stay on automatically calculate but I only want the UDFs to work when a cell they're referencing changes

Any help on this would be very much appreciated, thanks!

The aim of the worksheet is to eventually lock everything down and to give it to anyone that has no experience of wave analyses and can easily use it, therefore the sheet ideally needs to provide quick feedback when different inputs are changed and show how the different inputs effect the outcome. Basically an idiot proof program, therefore I am not sure macros will quite achieve what I am looking for.

UDFs are functions and will therefore be calculated whenever the sheet is recalculated.

So you're saying all cells with udf's will recalculate whether or not the changed cell is referenced?