There a couple of solutions you can try: - Double-check that your polkadot.js extension hasn’t popped up in the background - Try a different browser: quit your browser and try again with the same account —You can check your account on Polkadot Subscan https://polkadot.subscan.io/ before trying again to make sure you don’t double contribute. -Try clearing your browser's cache
Where in the subscan can I see if my dots were contributed?
you should be able to look for your transaction ID
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