I would say cases like these are not a solid case. Like LoyceV earlier pointed somewhere (not able to find now) and what diagram just above pointed. I earlier also used to connect them as alt accounts but now I see them as "possible alt accounts" (not 100% alts)
Bounty forms links are open to everyone and so anyone can fill up the form and cheat. It could be possible that a cheater tried to cheat by putting others name and putting his Ethereum address against the entry and it could also be possible that a participant thought that they have to fill the form again to request Ethereum address change or they filled the forms multiple times due to some network error and mistakenly submitted the form twice...etc.
Some are placed with an intent to cheat and some are by mistake. As a manager I used to apply conditional formatting to highlight multiple entries and it was very helpful in weeding out multiple entries.
Read:
https://stackoverflow.com/questions/21899516/how-to-highlight-cell-if-value-duplicate-in-same-column-for-google-spreadsheetHowever it is not 100% effective since it has one loophole but it could be overcome if forms are tweaked a little bit .
[
Note: You can apply it any row but be careful to change the row letter in the formula for formula to work ]
Or, a manager can enable option so that form takes only response from a computer :
https://www.labnol.org/internet/prevent-multiple-form-submissions/28675/ (haven't tested it)
If a manager has an active ongoing campaign, I suggest highlighting with conditional formatting method and if you want to apply it in a new campaign then I suggest enabling the option to accept only one response per person method. You can also use this to prevent any bot entries. There is also another method to control bots.
@BurstBurst, I would suggest reporting them to the manager instead. Doesn't needs DT attention but needs manager's attention more.