Most DNS server will keep cache for 2 (or even more) hours, i guess you didn't want for 2 hours.
It shows result moment ago:
$ dig -t txt dkim._domainkey.imved.im
...
;; ANSWER SECTION:
dkim._domainkey.imved.im. 1800 IN TXT "v=DKIM1\; p=...
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Re: DKIM setup on digitalOcean
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