Item sets didn't change over

Hi, I had updated my item sets 2 days ago, about a day before legacy client was retiring according to the date, i.e. on the 2nd of May, but all of my item sets have now reverted back to what I had about a month ago. I had alrdy made loads of changes. What actually happened? I had saved them each time I am sure, even used a new and some changed ones jst yesterday in the new client. Did they disappear or can I find them in a folder somewhere on my computer to get them back. Without them I am stuck not playing for a while then, at least not ranked....
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