If you have the Nascent Dawn quest active in your pursuits then that is the likely cause. The Nascen Dawn has two steps in it that require you to go visit a particular node. Until you clear those steps you won't be able to obtain new stems and you won't be able to combine existing stems.
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I have completed the whole nascent dawn quest and cant get resonate stems to drop from lost sectors or public events
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I don't, I completed it when it first dropped.
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That quest dropped for each character. So you may have completed it on character #1, but still have it on character #2 and character #2 is the one you're currently having issues with as an example. If you believe the character having the issue has completed that quest then please post a video or screenshots of all your pursuits pages, then interacting with Anna Bray's inventory on Mars to verify it isn't sitting there as an abandoned quest. Might as well include a capture of your current consumables inventory as well. If in video format then load it to a site such as Youtube and post a link to it here. If you take screenshots, then load them to a site like imgur and post links to the pics here.
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It started dropping them with this last update.
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i have a problem, i cant combine stems and i dont have any keys