I suggest checking the Audit Log to see who initiated the random entries you see in your account. This report also shows the changes made and who made them. Let me help you run the log report.
1. Select the Gear icon on the Toolbar. 2. Under Tools, select Audit Log. 3. Select the Filter button. 4. Use the fields on the Filter panel to choose the appropriate User, Date, or Events filter to narrow the results. 5. Select Apply.
The Audit Log shows 150 records at a time. If you have more records, you can select Previous or Next to move between pages of records.