🐛 Metadata Validation Error Persists After Correcting URL in Voting Flow

When adding a context during the voting process, if an incorrect URL is initially entered, the error message persists even after navigating back and entering a correct URL. This prevents users from proceeding, even with valid metadata input.

**Steps to Reproduce:**

1. Click on **“Vote”**
2. Add context
3. Choose **“Download and store data myself”**
4. Paste an **incorrect URL** (e.g., incorrect hash or url that returns text)
5. Error message **“Incorrect data format”** is shown
6. Click the **“Back”** button
7. Enter a **correct URL**
8. Error message **still shows “Incorrect data format”**

**Expected Behavior:**

After navigating back and entering a valid URL, the error message should clear, and the metadata should be re-evaluated correctly.

**Actual Behavior:**

The error message persists even after correcting the input, making it impossible to proceed with a valid URL.