QB Issue Resolution:

Were these transactions under the banking tab (meaning they were in the bank feed)?  If you disconnect the bank feed, those transactions disappear.  If you reconnect, you will get the last 3 mos. of transaction to come in.  But you won’t get April.  You would have to download them from the site and import them.  I have a blog post that demonstrates how do to that.

Resolution for Issue '103 Transactions missing in reconciled month. I can see them In the ledger but not in the register' available: Yes (Solved).
Source: Intuit Community forum.

103 Transactions missing in reconciled month. I can see them In the ledger but not in the register: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for 103 Transactions
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Error Recovery for 103 Transactions [Canada]
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