SHA1 missing for many entries

[moxious]

Example URL: https://victi.ms/hash/77f3139310c8bad98517efbb6d35657af8099340427f2faba9f69fba7c15dc072a6a18bfb478363aa4c87d7a3d78e8db4a9715a7a6b6aa87b29827e27cde596c

Many URLs have only a SHA512, which is fine, except that the SHA1 tab consistently shows up even when not populated. Other samples have SHA1, SHA512, and MD5; in the case where you see an MD5 tab, in general all three hashes are populated. When a SHA512 and SHA1 tab only are present, this seems to be a guarantee that the SHA1 tab is empty.