A stash entry can show more than one quantity, and they can honestly disagree. Once you know which is which, they stop looking like a mistake.
Remaining is the one you have
The number at the top of a stash entry is what’s left — what you could cast on with today. It’s the one to trust when you’re deciding whether you have enough.
Total stashed is history
If you’ve used some of a yarn, the entry also shows Skeins Originally Stashed and Skeins Used. That’s the record of what you bought and what has gone into projects.
This section only appears when the two numbers actually differ. If you’ve used none of it, there’s nothing to compare, so the app doesn’t show you the same figure twice.
Where the numbers come from
If the yarn came from Ravelry, so did the split. Ravelry records what you originally stashed and what you’ve allocated to projects, and Yarn Squirrel shows the remainder as your current amount and the original as history. Change it on either side and the next sync brings it across.
Half skeins are real
Quantities are shown to one decimal place, so 1.2 skeins stays 1.2 rather than being rounded down to 1. Partial balls are the normal state of a stash, and a number that quietly loses the remainder is worse than a slightly untidy one.
If you allocate yarn to projects on Ravelry, you’ll often see figures like 4.6 — that’s the leftover after the parts assigned elsewhere, not a rounding error.
What can I make with it?
A stash entry has Pattern Ideas, which looks for patterns that suit this yarn — using how much you actually have, so the suggestions are things you could finish rather than things you’d run short on.
Lengths and weights
Alongside the skein count you’ll see the total length and the total weight, plus the length per skein. Length is shown in whichever unit you prefer, and you can tap it to flip — see Yards or metres?.