Records of the same name and type must always have the same TTL value.

Symptoms

You are attempting to edit or insert a new DNS record when the system returns an error resembling the following:

domain.tld's “MX” records have mismatched TTL values (14400 and 300). Records of the same name and type must always have the same TTL value.

Description 

This will occur if you are adding a record to a zone that already contains a record with the same name and type (A records, CNAME records, TXT records, or MX records, for example) with already defined TTL values. If you are adding a zone with a different TTL value, the error will appear.

Workaround

Ensure that all records of the same name and type share the same TTL values. For example, if an MX record exists with a TTL of 14400, all MX records sharing the same name in the zone must share that TTL value.