I could not check your listing, as at this moment it is not active. In most cases the pricing is correct, but the host did setup things wrong. Common mistakes are;
- new hosts have special discount activated for first three bookings (mostly 20%)
- wrong setup of a weekly and/or monthly discount for stays 7 and/or 28 nights or more
It appears your price difference is 40%, so it looks one or more discounts are involved.
Please note it is not allowed to change the price of a confirmed reservation just for wanting more money.
Best regards,
Emiel