XRAY - Model racing cars

Starting a T4 build. The list of parts shows numbers after the part number in parenthesis. These numbers seem to have no relationship to the physical number used in that step or even in the kit as a total. An example for the T4 on page 6 it shows a bearing with (10) after the part number. What am I missing here? There are only 4 of these bearings in the kit.

If you mean part number 941015 (I assume you're looking at the 'list' of parts at the bottom of the page)
The 10x15x4 bearing has (2) in brackets.

An example would be the listing for bags 1.1 and 1.2 for part number 972050. There can't be 10 of these silicon O-rings. This is middle of page 6.

When you buy the spare part with that number it is 10 pcs in a bag.

That makes sense. Thanks! I'm going to stop over thinking this and just build!

In every bag you have exact quantity so you can build each step per instruction manual, the part numbers in first section show the spare parts and the quantity when you will buy them as spare part.