I imported all of my data… not sure why they are so different.
I should clarify, I connected my Garmin Connect account and imported that data.
Have you checked that your FTP matches on both sites?
I changed mine to match TP value 280 but it didn’t change my form, fitness, fatigue at all. They were close in value. 
You have a lot of runs with HR data. Intervals.icu calculates load for those using HRSS by default, which depends on your resting, threshold and max HR. This might be a bit different to how TP does it.
Also TP might be calculating load using threshold pace. If you capture that on Intervals.icu for Run in /settings and do “Update Activities” it will set it on all of your runs. Load (and hence fitness etc.).
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I set the run threshold pace and that seemed to change things a good bit 
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Well, I was planning on trying to make this ap a replacement for TP but I don’t understand the difference in how things are calculated. ¯_(ツ)_/¯
Make sure all your settings, thresholds etc. are accurate on the Settings page.
Then go to the Activities page, list view (button at the top), and select all activities (you might need to change the date filter). Click Edit, then Edit, then update your thresholds in there too, and click OK. Then do the same with Update Zones.
All that will ensure that your past and future activities have the right thresholds set (ignoring any changes over time), and it should adjust all your Fitness etc. stats too.
If there are still differences, be patient and read into how they might be calculated differently on different sites. Don’t assume TP is the way that works best for you.
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