Yes it may be confusing but 9956-41-400 is the part number for one aluminum washer, as there’s no such thing with a Mazda part number which is for a package of 5 washers. You can compare the price as mentioned above and figure it out the price for one from partsouq.com is already amazingly low comparing to the US price. What I’m trying to say is partsouq.com did nothing wrong giving you 7 washers. You can get more washers from Amazon or eBay, either OEM (very expensive), or aftermarket (cheaper) aluminum washers.
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The way the drain plug located on the oil pan, using standard ramps so that the front of the CX-5 is much higher is actually beneficial to drain the oil completely. I don’t bother to use floor jack and then jack stands just for changing oil, and this’s what I do with self-made 2X10’s:
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It’d be appreciated if you can report the oil level before and after oil change (hot or cold as long as it’s consistent although I prefer cold). And the actual oil quantity you used. Honestly I believe you need more than one 5-quart jug (5.5 quarts?) for oil change on your 2.5T.