Hi CLZ team,
You have errors in the numbering of the Blue Beetle Volumes. Essentially the Vol. 2 you have is a duplicate entry.
Vol. 1
#1-11 & 31-60 were published by Fox features
https://www.comics.org/series/127/
#12-30 were published by Holyoke. You currently have this series mistakenly listed as Vol.2. All the issues you currently have in Vol.2 are duplicate entries.
When Fox Features Syndicate ran into financial difficulties in 1942, Holyoke Publishing (who was also a printer, and to whom Fox owed money) took over the publication with issue 12. In 1944, when Fox was back on their feet, Fox resumed publishing Blue Beetle with issue 31.
From here each series is actually volume less than you have it listed
The actual Vol. 2 is the series you have listed as Vol. 3
https://www.comics.org/series/1081/
The actual Vol. 3 is the series you have listed as Vol. 4
https://www.comics.org/series/1614/
Then the actual Vol. 4 is the is series you have as Vol. 5. It comprise only #50-54
https://www.comics.org/series/1666/
Vol. 5 is listed as Vol. 6
Vol. 6 is listed as Vol. 7
Vol. 7 is listed as Vol. 8
Vol. 8 is listed as Vol. 9
Vol. 9 is listed as Vol. 10
Vol. 10 is listed as Vol. 11