I have created a multisheet workbook for my staff.

One of the pages summarises results from the other worksheets.

On this summary page, I have used check boxes in one of the columns to allow
users to select relevant records and then filter for those records to show
only those where the check boxes are True.

Am experiencing problems with:

1. After filtering, some of the check boxes that were previously checked are
no longer checked.

2. Removing the filter and reapplying the filter returns different records.

Any ideas would be appreciated.
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Many Thanks
EGGcel