Line graph capturing too much data

Hello. I built a simple line graph using imported data from Splunk. The chart should display hourly data going back 24 hrs. However, It’s pulling data from 18 days ago which makes my graph unusable. Other graphs using similar data look good. Any suggestions? Thanks!

Are you using specific timeframe? From the screenshot, it looks like the specific timeframe is set to @month.
Try using the specific timeframe with -24h.