can't build in certain blocks

[MySweetPass1on]

USERNAME: umefuji
APARTMENT COORDINATES (F3 TO VIEW): 1340, 44, 1306
ISSUE: so i was trying to build and there were some blocks where i just couldn't build? i have no idea why.
ADDITIONAL INFORMATION: here's some images of the blocks, though there may be more. (the block i can't build is circled in red)

 

[Yonio]

ACCEPTED
Your housing issue has been accepted and solved!​

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ADDITIONAL NOTES
If you need further assistance, you can privately message
me (Yonio#5112) or any other available Admin+ via Discord
so that we can solve any other inquiries you may have​