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Solution: If the Contractor has some segment-locking options enabled, they are likely to be the reason for this issue. Ask your contractor to review project-related settings that were mentioned above. If you are a linguist, ask your XTM Cloud project manager to forward your questions to the contractor.
Segments locked in offline-translation XLIFF file
Sometimes segments might be locked in XTM Workbench due to the fact that they have been locked in a generated offline-translation XLIFF file. See the following article to learn more about locking segments directly in such XLIFF file: How to translate offline (use of XLIFF files).
Solution: Make sure that the user who is performing the translation in XTM Workbench has permissions to unlock segments [Users → (select a user) → Edit user → Access rights → Segment locking rights → Lock and unlock OR Unlock only].