unfortunately you cannot recently Summer 2019 release hit preview sandboxes and the one you are trying to clone is from CS75 pod which is in the latest release whereas production is still running in spring 2019. They will get upgraded to Summer 2019 on june 15 post which you should be able to clone.
NOTE You can only clone sandboxes that are on the same major Salesforce version as the production org. During the transition to a major release, some sandboxes get upgraded before others. To determine the Salesforce version for your production and sandbox orgs, see this knowledge article. To determine when your production org or sandbox gets upgraded, see the Salesforce maintenance schedule.