The number of disposals is not the same as the total number of transactions you have, but refers instead to the number of individual gain/loss transactions and depends on the cost basis method used.
You buy BTC on three occasions:
0.10 BTC bought on January 1st, 2020
0.25 BTC bought on January 15th, 2020
0.35 BTC bought on March 24th, 2020
You then decide to sell all BTC in April the same year:
0.7 BTC sold on April 10th, 2020
This single Sell transaction will now result in three disposals since your purchase history of 0.7 BTC spans from January 1st - March 24th. Using the built-in Cost Analysis tool in Coinpanda shows this in more detail: