The glasstable view shows values based off a single point in time, where the deep-dive view shows values over a range of times. So for example, if you have 1 minute windows set, and you did not get data within that 1 minute window, it will show N/A in the glasstable view. Whereas, it will show in the deep-dive views since the windows are relative to what timerange you set.
So it sounds like your backfill is not working correctly since you claimed to have backfilled the past 7 days but there are few data points. You should first run a query over your raw data to verify you have data to summarize in your summary index. You can also try to create a test service and KPI against your internal index which has a steady stream of data. You should then backfill this into your new KPI for the past 7 days to see if you get values. If this produces N/A's then you definitely have a problem and need to open a support case
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