Excel

hi Kristian712​ This is a very common Excel behavior, and in most cases it’s not a bug — it’s Excel being too smart for its own good. Here are the real reasons it happens, in simple terms:

You’re actually selecting a Table column

If your data is inside an Excel Table, clicking one cell can cause Excel to auto-select related cells in the same column.

How to check:

• Click anywhere in the data
• Do you see Table Design on the ribbon?
• If yes → it’s a Table

Fix (if you don’t want that):

• Click inside the table
• Go to Table Design → Convert to Range

Double-clicking selects “related” cells

If you double-click a cell, Excel tries to auto-select the contiguous range (downward if data exists).

Fix:

• Use a single click instead
• Or press Esc after it happens

It’s trying to auto-fill a pattern

If cells below are empty or follow a pattern, Excel thinks you want to select them for:

• Auto-fill
• Copy
• Formula continuation

Fix:
Turn off:
File → Options → Advanced → Enable fill handle and cell drag-and-drop

It could be a merged cell issue (very common)

If any of the selected cells are merged, Excel behaves very weirdly when selecting.

Check by:

• Select the area
• Go to Home → Merge & Center
• If it shows “Unmerge” → that’s your problem

Touchpad/trackpad issue (yep, this happens!)

On laptops, accidental tap + drag selects extra cells without you noticing.

Test:
Try using a mouse only and see if it stops.