Ltc1760 startup exception

My ltc1760 encountered a problem. When I started, I heard an abnormal scream of inductance. Check the waveform of SW point, as shown in Figure 2. The normal waveform is as shown in Figure 1. I want to inquire whether to connect 200K resistance to the ground with intb. SCL and SDA pull up 3.3V to test the voltage of ith, which rises and falls to 0V. Iset is the same. I want to ask how to solve it?

Figure 1

Figure 2