Wife's solicitor's financial figures seem incorrect

My wife and I both did Form-E disclosure and after some back and forth seemed to reach agreement on our assets.

I've received a settlement proposal from her solicitor and going through it in detail (creating a spreadsheet, etc) I've seen a number of discrepancies. e.g. a thousand here or there on equity in property - they are not big differences overall but I would expect a solicitor to be painstaking on such matters, it's what they do (and this is a firm with good reputation we have used before).
They haven't explained any differences so I plan to raise this, but is it typical? Is it likely the solicitor has actually done the calculations, or that my wife has provided the numbers and they simply pass on what they are given?

It's just a bit frustrating as every back-and-forth drags things out and increases costs.