You may seek to check the first misbegotten keyboard, against database for exact replacement.
Other numbers used to identify exact 'specific build sales model years' are useful to reference.
MacBook (13-inch, Mid 2010)
Introduced May 2010
Discontinued July 2011
Model Identifier MacBook7,1
Model Number A1342
EMC 2395
Order Number MC516LL/A
Some point, the unibody A1342 had been revised; a few years into the series. Yours? Maybe one.
Several numbers may be re-used that cannot be confirmed as precise reference part numbers.
Some of the keyboards likely may require a top-case to be included ~ for proper fit and finish.
The those parts can be available separately, but need to fit correctly; the top-case actually is one.
Topic of keyboard replacement; including comments, is available from third-party, to read online.
..Need to replace keyboard..
MacBook Unibody Model A1342
To inquire of the original reseller of the keyboard/part, about their return policy; or just dive in
& have present service business, acquire parts. (IF they are Apple authorized, with proper parts.)
An incorrect &/or mis-match of keyboard without correct top-case would explain this issue.
You may need to check online ifixit pages to affirm their understanding of what part you need.
Could be someone may have acquired different part(s) or build year/sales order number?
While I've an early 2006 MacBook1.1 (1.83GHz) here, I've not had any keyboard issues.
Should one seek to acquire all new subcomponent parts:
MacBook Unibody Model A1342 Upper Case Replacement
Here's the part:
MacBook Unibody (A1342) Upper Case
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As volunteers, we're not unlike any visitor to the site ~ except we've decided to try and help.
Good luck & happy computing!🌻|🐝
